| Niederkassel to Devnya | 1,095.38 mi (1,762.84 km) |
| Niederkassel to Dimitrovgrad | 1,066.95 mi (1,717.10 km) |
| Niederkassel to Dobrich | 1,092.39 mi (1,758.03 km) |
| Niederkassel to Dospat | 1,031.00 mi (1,659.23 km) |
| Niederkassel to Dupnitsa | 962.69 mi (1,549.29 km) |
| Niederkassel to Elhovo | 1,099.56 mi (1,769.57 km) |
| Niederkassel to Etropole | 969.82 mi (1,560.77 km) |
| Niederkassel to Gabrovo | 1,020.31 mi (1,642.04 km) |
| Niederkassel to Gorna Oryahovitsa | 1,023.44 mi (1,647.06 km) |
| Niederkassel to Gotse Delchev | 1,018.93 mi (1,639.80 km) |
| Niederkassel to Harmanli | 1,083.88 mi (1,744.33 km) |
| Niederkassel to Haskovo | 1,070.97 mi (1,723.55 km) |
| Niederkassel to Ihtiman | 980.83 mi (1,578.49 km) |
| Niederkassel to Isperih | 1,045.39 mi (1,682.40 km) |
| Niederkassel to Kardzhali | 1,076.32 mi (1,732.18 km) |
